Exfo FTB-7000 OTDR for FTB-200 v2 Instrukcja Użytkownika Pobierz pdf (Strona 290)

100

101

Maintenance

276 FTB-7000 Series

Verif ying Your OTDR

To determine the measurement range (singlemode models only):

1. Connect the OTDR as indicated below. Other configurations are

possible, but the fiber should have several sections longer than 2 km,

with no loss greater than 8 dB and with the average attenuation not

exceeding 1 dB/km. A variable attenuator will be used to adjust the loss

in the span.

One or several non-reflective events with a nominal loss of 0.5 dB

should be present. Join a series of fiber reels between the OTDR and

the variable attenuator for a length of approximately 20 km. Join

another series of reels to complete the fiber length needed for the test.

³ Ensure that the OTDR port and connectors are correctly cleaned.

³ Make sure the fiber settings are accurate (IOR, Helix factor, and

RBS).

1 to M reels of fiber

( Add as needed )

OTDR

2 km or more

Fiber End

Measured

Fiber Even

4 km min

2 km or more

20 km

Variable attenuator

2km or more

2 km or more

Fiber end

1 to M reels of fiber

(Add as needed)

4 km min.

Measured fiber end

1 2 ... 285 286 287 288 289 290 291 292 293 294 295 ... 338 339

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Exfo FTB-7000 OTDR for FTB-200 v2 Instrukcja Użytkownika Strona 290

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